Pressure-relieving device.



Patented Aug. I4,l900. C. KUHLEWIND.

PRESSURE BELIEVING DEVICE.

(Applicatioxi filed Dec. 22, 1599.

3 Sheets$heet l.

INVENTOR as F No. 656,!4I.

(No Model.)

WITNESSES No. 656,!41. Patented Aug. l4, I900. c. KUHLEWIND. PRESSURERELIEVING DEVICE.

(Application filed Dec. 22, 1899.)

3 Sheets$heet 2,

(No Model.)

INVENTOR 6 WL4 WITNESSES rmo Nn. 656,l4!. Patented Aug. I4, 1900.

' C. KUHLEWIND.

PRESSURE RELIEVING DEVICE.

(Application filed Dec. 22, 1899.)

3 Sheets--Sheet 3,

(NoModeL) mvsm'on 4.

WITNESSES .m: uomus PETERS co, FNOTO-LITPKl, wAsmNGTON. u c,

UNITED STATES- 'ATENT FFICE.

CORNELIUS KUHLEWIND, OF KNOXVILLE, PENNSYLVANIA.

PRESSURE-RELIEVING DEVICE.

SPECIFICATION forming part of Letters Patent No. 656,141, dated August14, 1900. Application filed Decemloer22,1899. SBIlELlNO. 741,208. (it,model.)

To aZZ whom it may concern/.-

Be it known that LICORNELIUS KUHLE- WIND, of Knoxville borough, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Pressure-Relieving Devices, of which the followingis a full, clear, and exact description, reference being had to theaccompanying drawings, forming a part of this specification, in which-Figure 1 is a top plan view of my improved relief device. Fig. 2 is asectional side eleva tion. Fig. 3 is a vertical cross-section. Fig. atis a partial plan view showing a modified form, and Fig. 5 is a brokenside elevation of Fig. 4.

My invention relates to devices for relieving the pressure upon rolls orsimilar apparatus when this pressure exceeds a determined limit, and isdesigned to provide a device for this purpose, containing movable partsprovided with inclined faces,which shall wear evenly and uniformly underservice, which maybe cheaply and easily constructed, and which will giveefficient relief action.

In the drawings, referring to Figs. 1, 2, and 3, 2 represents aroll-breaker having a cylindrical socket containing a lower rotatableplug 3, which is provided with a set of upper inclined wedge faces 4,forming curved ratchet-teeth. The lower end of this plug is made in theform of an eccentric hub 5, as shown in dotted lines in Fig.1, andfitting the periphery of this hub is a loose pushblock or link 6, havinga curved extension 7, which fits in a corresponding recess in awedge-block 8, which slides horizontally within a laterally-extendingsocket of the breaker. This horizontally-movable block 8 engages avertically-movable wedge-block 9, the two having coacting inclinedfaces, and the block 9 is provided with a central square hole in whichfits alocking-block 10, having a locking extension 11, which fits withina recess in the block 8. The hole through the block 9 opens into arecess in its back portion, within which fits the head 12 of avertically-movable slide 13. This head is provided with an inclined facebearing upon a corresponding face on the locking-block and is recessedto allow a certain range of upward movement before it engages aprojection 14 upon the block 9, and

thereby lifts this block. The body of the slide 13 projects over theupper end of the wedgeblock 9, and the outer reduced portion 15 of thisbody is provided with a depending stem 16, which passes down through across-head 17 and is provided at its lower end with a nut. At the sidesof the slide 13 brackets 18 are secured to the breaker body and in theirouter ends are provided sockets for spiral springs 19, which surroundstems 20, secured to the brackets. These stems extend down through thecross-head 17, and their lower ends are provided with nuts, as shown inFig. 2. The springs 19 bear upon the cross-head and through the stem 16draw down the vertical slide and hold the parts in their normalposition.

To rotate the plug 3 when excessive pressure is exerted, I provide acorresponding cylindricalplug 21, having curved wedgefaces formingteeth, which fit upon the teeth 'providedat their outer ends withinclined faces 26, which coact with similar faces upon-longitudinally-inovable blocks 27, normally pressed forward by springs28. The supplemental spring wedge system thus provided acts to lift theupper plug slightly from the lower one and is arranged to be actuated bythe ordinary working pressure of the rolls. When the piece enters thepass in the rolls and the pressure is brought upon them, thissupplemental wedge system will be actuated and the upper plug 21 moveddown into contact with the lower turning plug 3, being maintained inthis position during the ordinary operation of the mill. By this systemthe jar and vibration incident to the entering of the piece in ordinarymills are largely done away with.

In order to afford means for relieving the pressure by hand wheneverdesired 1 pivotally connect the central stem 16 by a lever 29 with ahand-lever 30, pivoted to a bracket at 31. The lever 29 is fulcrumed at32 and the pin at its upper end enters a slot 35 in the lever, so thatwhen the excess pressure is automatically relieved this pin will movedownwardly in the slot and leave the handlever stationary. When,however, it is desired to relieve the rolls by pressing down upon thehand-lever, the lever 29 will move the cross-head 17 upwardly, andthereby first release the locking-block by drawing up the slide andthereafter pull upwardly the main wedge-block 9 by the engagement withit of the head of the slide.

In the operation of the device the parts maintain their ordinaryposition, with the teeth of the two plugs in contact, until excessivepressure is caused, as by a piece sticking in the rolls. \Vhen thisoccurs, the upper plug will be moved down, and being held againstrotation its inclined teeth will cause a turning movement of the lowerplug 8, the eccentric hub portion of which will move the push-block, andthereby force the lockingblocks back within the wedge 9, the slide 13moving upwardly against the pressure of the springs 19. The wedge-block9 also moves upwardly, the block 8 being forced out horizontally in itssocket. The pressure upon the roll is thus relieved, and as soon as theexcessive pressure is removed the parts will resume their normalposition, the spring between the plugs aiding in turning the lower plugand bringing the parts back into their normal place.

In the form of Figs. 4 and 5 the construction is the same as that of thepreceding figures, excepting that instead of the wedge system acted uponby the push-block I provide a screw system which gives substantially thesame result. In this form the head 7 of the push-block 6, which is actedupon by the eccentric hub 5, acts upon the inner head M of ascrew-threaded stem 35, which extends outwardly through the breaker.Surrounding this stem within the breaker-body is a hollow shaft 36,which is provided with an inner screw-thread engaging the screw-threadedstem and with outer square screw-threads 37 engaging correspondingthreads in the recess of the breaker therefor. To the outer end of thishollow shaft, which forms a nut for the stem, is secured a lever 38,provided with a counterweight 39. The head 34 of the inner stem beingsquare, this stem is held against rotation, and consequently when theexcess pressure is brought to bear the head 3i, being forced out, willcause the hollow shaft 36 to turn and lift the lever against the actionof its counterweight. As soon as the excess pressure is removed thecounterweight will move the lever down and turn the hollow shaft or nut,the head of the stem moving in and the parts resuming their normalposition.

The advantages of my invention result in part from the use of theinclined teeth between the plugs or wedge-blocks, which give uniformwear and long life to the device, and, further, from the simplificationand compactness of the device.

Many variations may be made in the form and arrangements of the partswithout departing from my invention.

I claim- 1. Ina relief device, a vertically-movable element, a rotatableelement coacting therewith, and a yielding device arranged to hold therotatable element against turning; substantially as described.

2. In a relief device, a vertically-movable element held againstrotation and having an inclined face, a rotatable block havingacorresponding inclined face, and a yielding pressure device arranged toresist turning of the rotatable block; substantially as described.

3. In a relief device, a reciprocatory block, having an inclined face, arotatable block having a corresponding face coacting therewith, a cam oreccentric arranged to be actuated by the turning of the rotatable block,and a yielding pressure device coacting with the cam; substantially asdescribed.

i. A relief device for rolls, having a vertically-movable angular blockguided in an angular socket, and having inclined teeth, a retatable plughaving correspondingly-inclined teeth, an eccentric or cam upon therotary plug, and a yielding pressure device acted upon by the cam;substantially as described.

5. In a relief device, a reciproeatory block held against rotation, arotary element arranged to be turned by reciprocation of the block, ayielding pressure device arranged to be actuated by the turning of therotary element, and hand mechanism arranged to relieve the yieldingpressure device; substantially as described.

6. In a relief device, a vertically-movable plug having inclined teeth,a rotary plug having corresponding teeth, said rotary plug having a camor eccentric, and a spring-pressed Wedge system arranged to be actuatedby the cam or eccentric; substantially as described.

In testimony whereof I have hereunto set my hand.

CORNELIUS KUHLEWIND. Witnesses:

G. I. IIOLDSHIP, II. M. CORWIN.

